G'morning all,
Beneath a Steel Sky and Lure of the Temptress are both started from INIs.
I'd like to add these two games to Steam, but Steam requires that files you add be executables. Is there any way around this, does anyone how I can add them to Steam?
Thank you!

You could try it via batch files (or try adding the links that launch them themselved).
If you want to try the batch file route:
Open notepad.
Right click on the link that you want to add and chose properties.
Copy the "Start in:" field and paste it into notepad, prefixing it with "@cd " (without quotes), for example:
@cd "J:\Program Files\GOG.com\Simon the Sorcerer\ScummVM"
Copy the Target field and prefix it with "@start", for example:
@start "J:\Program Files\GOG.com\Simon the Sorcerer\ScummVM\scummvm.exe" -c "J:\Program Files\GOG.com\Simon the Sorcerer\simon.ini" simon1
Save the thing as something.cmd (be sure to set the save filer to "all files", so that it doesn't end up as a text file). You should be able to launch the game by opening that file. Now try to add it to steam (you might have to change the filter to "All Files" in the open dialog as most programs don't list cmd files by default).
Edit posted at the same time as Weclock. Try his approach first.

Why do you want to add these games to Steam? Steam overlay is not working with Dos games and games which are using DosBox to run, so you can't chat with your friends in game.

it can tell his friends when he's playing the game in steam.
I did the same thing with notepad, but named it Duke Nukem Forever, so people see me as "In non-steam game Duke Nukem Forever"

But Steam overlay is not working with Dos games on Steam. I am talking about "Shift + Tab" thing.

certainly it won't, but I was telling you the benefits of adding a game to steam also include telling your friends to f off

i just tested it, and my method works. I'm also testing the "post merge function" and hoping to have my answer marked as the solution.

Thanks, Weclock! :)

no problem, I do my best. :)